No, 3.] Some Comparative Trials of Insecticide Pumps etc. 117 



Examined 15th June :•— 



Plots Nos. /, 2.— Practically no Red Spider, only one or two 



leaves found by careful searching. 

 Plot No. 3. — Nearly as good. 



Plots Nos. 4i 5. — Bushes here and there showing little spider. 

 Plot No, 6. — Not so good as the two previous. 



„ 7. — Still more Red Spider visible. 



The plots and surrounding four rows easily distinguished at a 

 glance from rest of garden. 



Examined 15th July. Heavy rain has brought on vigorous flushing 

 and the plots and surrounding garden are uniform in appearance. 



It was intended to redress all the plots at the expiration of three 

 weeks' time, but a continuance of showery days made this impractic. 

 able. 



An interesting point brought forward in the foregoing experi- 

 ments, is the success attending the application of such an inexpen- 

 sive insecticide as dry sulphur. All preparing and mixing of ingredi- 

 ents is done away with, a great saving of labour is effected as water 

 carriers are not required, and the sprayers are much less apt to choke 

 and get out of order than those containing a liquid. 



Some extent of garden was dressed by women shaking bags of 

 sulphur over the bushes. The bags were formed from squares of 

 dammer.* A large area can in this manner be rapidly got over, but 

 very much more sulphur is required than when using the sprayers 



Sulphuring to be effective should be done in the early morning 

 when the dew is on the leaves. The sulphur then forms a thin 

 coating over the surface of the leaf. This result is not so well secured 

 after rain, as the latter tends to collect in drops on the smooth 

 surface of the leaf, causing an unequal adhesion and distribution of 

 the sulphur. 



With regard to liquid preparations of insecticides, allowing the 

 drawbacks previously mentioned, they possess the advantage of being 

 applicable throughout the day. 



* Obtainable from the Elgin Mills Company, Cawnpore. 



